I can't subscribe to MQTT Payload Fields

Application Development
1

Hello,

I’m new using TTN. I created an application and add a device, thethingsnode. I recieved the data in my console. When I try to subscribe to MQTT using Mosquitto, the ping is working, but I’m not receiving any data.

The commands I have tried are:

mosquitto_sub.exe" -h eu.thethings.network -d -t '[AppID]/devices/[DevID]/up/payload_fields' -u [App ID] -P [App key] -v

mosquitto_sub.exe" -h eu.thethings.network -d -t '[AppID]/devices/[DevID]/up' -u [App ID] -P [App key] -v

mosquitto_sub.exe" -h eu.thethings.network -d -t '/devices/up/payload_fields' -u [App ID] -P [App key] -v

mosquitto_sub.exe" -h eu.thethings.network -d -t '/devices/up' -u [App ID] -P [App key] -v

I do not understand it, can you help me?

Thanks in advance!

2

Where’s the funny opening double quote in mosquitto_sub.exe" coming from, and where is it closed? And did you see the “When using Windows” remarks in the documentation?

Also, it seems you’re missing a wildcard for the application id and device id in some of your tries, like -t "+/devices/+/up". The following will just capture everything there is: -t "#".

Finally, you cannot subscribe to +/devices/+/up/payload_fields. For EU868, see also the status page.

1 Like
3

The first missing double quote is copy paste mistake.

When i use the Wildcards + and # like your example, i get the error:

Error: Invalid subscription topic ''+/devices/+/up'', are all '+' and '#' wildcards correct
Error: Invalid subscription topic ''#'', are all '+' and '#' wildcards correct?
4

I see double single-quotes there, which makes me think you used single quotes in the command line? Please show the full command line. And again: did you see the “When using Windows” remarks in the documentation?

Please see also How do I format my forum post? [HowTo] to avoid the forum from showing funny curly quotes.

1 Like
5

You are right! I used single quotes, problem solved by using double quotes.

I read the documentation, didn’t see the difference in quotes.

Thanks you very much!

7

When using WSL (Windows Subsystem for Linux) single quotes can be used.
(But that’s Linux running on Windows, not plain Windows.)